With small Halloween cookie cutters or sharp knife, cut small shapes, such as half moons, from remaining pie crust; reserve shapes. Place cut-out crust on top of pie; seal edges and flute. Brush small shapes with water; attach to top crust.

In small bowl, beat egg yolk and 2 teaspoons water until well blended. Brush top crust with egg yolk mixture.

Bake at 425°F. for 25 to 35 minutes or until crust is golden brown and filling is bubbly. Cover edge of crust with strips of foil after 15 to 20 minutes of baking to prevent excessive browning. Let stand 10 minutes before serving.